--  http://www.java2s.com/Code/PostgreSQL/Store-Procedure-Function/Createasimeplefunction.htm
CREATE TABLE employee (
     ID         int,
     name       varchar(10),
     salary     real,
     start_date date,
     city       varchar(10),
     region     char(1)
 );

insert into employee (ID, name,    salary, start_date, city,       region)
                      values (1,  'Jason', 40420,  '02/01/94', 'New York', 'W');

insert into employee (ID, name,    salary, start_date, city,       region)
                      values (2,  'Robert',14420,  '01/02/95', 'Vancouver','N');

 insert into employee (ID, name,    salary, start_date, city,       region)
               values (3,  'Celia', 24020,  '12/03/96', 'Toronto',  'W');

 insert into employee (ID, name,    salary, start_date, city,       region)
               values (4,  'Linda', 40620,  '11/04/97', 'New York', 'N');

 insert into employee (ID, name,    salary, start_date, city,       region)
               values (5,  'David', 80026,  '10/05/98', 'Vancouver','W');

 insert into employee (ID, name,    salary, start_date, city,       region)
               values (6,  'James', 70060,  '09/06/99', 'Toronto',  'N');

 insert into employee (ID, name,    salary, start_date, city,       region)
               values (7,  'Alison',90620,  '08/07/00', 'New York', 'W');

 insert into employee (ID, name,    salary, start_date, city,       region)
               values (8,  'Chris', 26020,  '07/08/01', 'Vancouver','N');

 insert into employee (ID, name,    salary, start_date, city,       region)
               values (9,  'Mary',  60020,  '06/09/02', 'Toronto',  'W');

CREATE OR REPLACE FUNCTION title (
      i integer
) RETURNS employee.name%TYPE AS $$
DECLARE
  ret employee.name%TYPE;
BEGIN
  SELECT name from employee where id = i INTO ret;
  RETURN ret;
END 
$$ LANGUAGE plpgsql;




